General Thomas Stafford, who commanded four NASA space missions and Captain Eugene Cernan, the last man to walk on the moon, meet Olympic superstar Michael Phelps the day after their countryman won his eighth gold medal at the Beijing 2008 Olympic Games. The meeting took place at the OMEGA Pavilion on the Olympic Green on 18 August 2008. The three men are brand ambassadors for OMEGA, Official Timekeeper of the Olympic Games and maker of the Speedmaster, the only wristwatch ever to have been worn on the moon.